Stuffing box mounting for pumps



Au .3,194s. y, EHRIG 2,446,463

STUFFING BOX MOUNTING FOR PUMPS Filed March 25, 1946 Q 4 V/c rozzCfl/a/i V INVENTOR. I 5 iv i 2/ Patented Aug. 3, 1948 UNITED STAT FFICEClaims. 1

This invention relates to water pumps, especially the type employed inthe water system of steam locomotives and it has particular reference tostuffing boxes and mounting therefor as used in such pumps.

Ordinarily, water pumps of the dual cylinder type as used to supplywater to the boiler of a locomotive are equipped with stufiing boxes inthe adjacent heads of the opposed cylinders, leaving substantially theentire head area exposed to the erosive eiiects of water with noprovision for minimizing these destructive eifects nor for renewing theeroded parts in the pump. As a result, the pump often becomesineilective in the course of a run, causing expensive delays in shippingand transportation as well as expense incident to replacement of a newand unknown pump.

It is the principal object of the present invention to provide astuiiing box mounting for Water pumps which, while not immune toerosion, may be replaced in a pump in a minimum of time and hasassociated therewith a replaceable ring element adapted to overlie avital part of the pump most Vulnerable to erosion to shield the sameagainst premature impairment. Moreover, the ring element obviates thenecessity for the replacement of the entire pump which is an expensiveunit in the water system of a locomotive.

It is further an object of the invention to provide a stufiing boxmounting for water pumps which is constructed for installation inconventional pumps with due regard for clearances with respect toassembled parts of the pump to enable the mounting to be installedwithout requiring that the entire pump be dismounted for the purpose.Moreover, provision is made for positively securing the elements of theimproved mounting against accidental displacement, once they areassembled in proper relationship in the pump.

With the foregoing objects as paramount, the invention has furtherreference to certain fea tures of accomplishment which will becomeapparent as the description proceeds, taken in connection with theaccompanying drawing wherein:

Figure 1 is a fragmentary side elevational view of a conventional waterpump in vertical section. showing the stufiing box mounting of theinvention installed therein.

Figure 2 is a view in transverse section, taken on line 2--2 on Figure1.

Figure 3 is a top perspective view of a stufiing box per se.

Figure 4 is a top perspective View of the stuffing box mounting per se.

Figure 5 is a perspective view of the erosion resisting ring, and

Figure 6 is a top perspective view of a modified form of the inventionin which the mounting and box are in a single piece.

Continuing with a more detailed description of the drawing, it isconsidered unnecessary to identify each. and every element of the waterpump shown in Figure l in view of its conventional and well knownconstruction, other than to point out that the piston rod ll), carryingpistons H in cylinders 12 is reciprocable through the intermediatestuifing box chamber [3. Each cylinder l2 has a liner it which isreplaceable but the conventionally constructed pump has no provision forreplacement of parts which become impaired by erosion caused by waterimpelled under great force at points adjacent to the lower; moststufiing box, centrally mounted thereon, resulting in leakage andconsequent impairment in the efilciency of the pump. There is obviouslyno alternative, aside from the provisions to be hereinafter describedbut to replace the pump with an unworn substitute.

The invention provides a mounting consisting of an exteriorly threadedbody [6 whose upper portion is tapered at a but whose lower portion b isstraight walled, as shown, although threaded. The body Hi is providedwith a central bore I! which is threaded at E8 in its upper end, asrepresented in Figures 1 and 4, to receive the threaded lower end It ofthe stuiling box 20. The stufling box 28 is shouldered at c, whichshoulder bears upon the annular lip d surrounding the bore H of the bodyIt.

An erosion shielding ring 2! is threaded upon the lower end of the bodyI6, said ring being interiorly threaded to conform to threads b of saidbody. Wrench recesses e are provided in the lower face of ring 2! tofacilitate its installation and removal. A dowel or key 22 is likewiseprovided to be received in a bore made jointly in the threads I) of thebody 16 and those of the ring 2! to prevent backing off of the latter.

To install the stufiing [box mounting described, the conventionalstuffing box is removed and the partition I5 is reamed to obviate anytrace of erosive action and afterwards threaded. Obviously, thesethreads are made to conform to the threads of the mounting body I6,which latter is then threaded into place in the manner shown in Figure1.

To hold the body It in position, the ring 2| is threaded onto the lowerend of the body by means of threads 12. When tightened in place, thedowel 22 is driven into the aligned parts of the bore made to receiveit.

It is apparent from Figure 1 that the erosion shielding ring El may bepassed through the liner M of the cylinder I2 without removing the saidliner. This provision saves much time in assembling.

It is likewise apparent that when all parts are assembled as shown inFigure 1, water under high pressure will have little effect to impairthe pump since all erosive action is borne by the replaceable shieldinring 2! of the invention and the material of the parts is selected witha. view towards resisting erosion. However, should wear occur on theseparts, replacement issimpleand inexpensive.

In Figure 8 is shown a slight modification of the invention. Instead ofthe parts being separately made and assembled, this figure shows thestuffing box and body id as being constructed in one piece, which afterinstalling on the pump as previously described, is secured in place bythe erosion shielding ring 2| exactly as .in the preceding instance. Thesame characters or reference are used to indicate like parts in themodir'ied form shown, to clarify their relationship.

Manifestly, the construction as shown and described is capable of somemodification and such modification as may be construed to fall withinthe scope and meaning of the appended .claims is also considered to bewithin the spirit and intent of the invention.

What is claimed is:

1. In a water pump, a cylinder head, a stuffing box mounting comprisinga body having a central bore, the upper portion of said body beintapered and threaded for reception by a threaded opening in saidcylinder head, the lower portion of said bodybeing straight walled andthreaded, an erosion shielding ring mountedon' the lower portion of saidbody and bearingagainst the undersideof said cylinder headastuffing boxem bracing the ce tr l b e of said body a d means for holding saidshielding ring against rctative displacement on said body.

2. A stuffing box mountin for water pump,

comprising in combination with the cylinder head of said pump, a taperedand threaded body receivable in an opening in said cylinder head, acentral bore and a threaded extension at its lower end, a ring threadedon said extension to bear against and substantially cover the oppositeside of said cylinder head to-shield the same, means for holding saidring against rotative displacement and a stufiing b x disposed in thebore of said body.

3. A stuffing box mounting for a water pump including a cylinder head,an exteriorly tapered body retained in the piston rod opening in thecylinder head of said Water pump and having a center bore, a stufiingbox in said bore, a threaded extension on said body, and a ring mounted,on said extension to substantially cover and shield the face of saidcylinder head.

A'device for resisting the erosive action of water on the cylinder headin a water pump, comprising in combination with said cylinder head, astuflin box mounting consisting of a tapered and threaded bodyreceivable in the piston rod opening of said cylinder head, a stuffingbox supported by said head, and a ring threaded onto the lower end ofsaid body whose area substantially covers the area of said cylinder headvulnerable to the efiects of erosion.

5. In a water pump, a device for resisting the erosive action of wateron the cylinder head of said pump, comprising in combination with saidcylinder head, a body having a central bore, a stuiiing box in saidbore, said body further having a tapered and threaded exteriorreceivable in an opening in said cylinder head and a retainer ring whosearea carries the vulnerable area of said cylinder head, receivable onthe lower end of said body.

VICTOR C. EHRIG.

Name Date Blunt May 7, 1935 Number

